Automatically-computing weighing-scale.



A. H. SHGGK. AUTOMATIGALLY COMPUTING- WBIGHING so ALE.

APPLICATION-FILED APR. 28, 1909.

Patented Mar. 15, 1910.

3 SHEETS-SHEET 1.

Pneus, wAsmNa Nunzw a. GRANAM Co. PHo'ro-Uwoalu A. 11. SHOCK. y AUTOMATIGALLY COMPUTING WBIGHING SCALE.

APPLICATION FILED APR.28, 1909. 952,219. y Patented Mar.15,1910.

3 SHEETS-fSHEET 2.

ANDREW B. GRAHAM cuJnow-Llruoomwsns WASHINGTONv n. c.

A. H. vvSHOCK. AUTOMATIGALLY COMPUTING WEIGHING SCALE.

APPLICATION 'FILED PRQZB. 1909. 952,21 9. Patented Mar. 15, 1910. I 3 SHEETS-SHEET 3.

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i UNirED ra ABRAHAM H. SHOCK, OF LANCASTER, PENNSYLVANIA, ASSIGNOR T0 LANCASTER SCALE COMPANY, OF ELIZABETHTOVN, PENNSYLVANA, A CORPORATION.

AUTOMATICALLY-COMPUTING WEIGHING-SCALE.

To all whom if, may concern:

Be it known that I, ABRAHAM H. SHOCK, citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Automatically- Computing YVeighing-Scales; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art t0 which it appertains to make and use the same.

This invention relates particularly to automatic price-computing weighing scales, though many of its features are well adapted to weighing scales in general.

rThe said invention has for its chief objects to attain greater delicacy and accuracy of the pivoting leverage and various adjustments of the mechanism, to increase its durability and efficiency and to improve it in divers details and as a whole.

To these ends the said invention consists in the construction and combination of parts hereinafter more particularly set forth and claimed.

1n the accompanying drawings Figure l represents a perspective view of the entire weighing mechanism, Fig. 2 represents a side elevation of the mechanism for transmitting motion from the scale-beam to the index, also showing certain proximate parts, some of which are sectioned vertically to exhibit the construction more clearly; Fig. 3 represents an end elevation of such mechanism, the bed plate and scale-beam being sectioned vertically and the index and dial being broken away; Fig. 4 represents a detail elevation of the arm 60, hereinafter described, and certain proximate parts; Fig. 5 represents a detail plan of the casting 87 and proximate parts; Fig. 6 represents a detail view, partly in cross-section, partly in elevation, of the scale-beam, its supporting yoke and attachments; Fig represents a detail view in elevation of certain endparts of said yoke; Fig. 8 represents a detail cross-section through one of the end pivots of the pivot-rod 5 in said yoke, its bearings and proximate parts; Fig. 9 represents in elevation the pivot rod 4, the parts in which it tits being shown in vertical section; Fig. 10 represents in detail the bear- Specication of Letters Patent.

Application filed April 28, 1909.

Patented Mar. 15, 1910.

Serial No. 492,627.

Ving rollers 97, and the parts between, and upon which they are placed; Fig. 11 represents in detail side elevation the proximate ends of the scale-beam; the pivots received between them and the inclosing blocks being shown in section; Fig. 12 represents in cross section and partly in elevation, the index-shaft, its pivots, bearings and supports and proximate devices; Fig. 13 represents a detail view of one of the end caps of said shaft, the proximate part of the latter being shown in side elevation, broken away; Fig. 14 represents a detail view of one of the pivot pins or rods for said shaft and the bored and recessed block in which it is mounted. Figs. 2 and 3 are on a larger scale than Fig. l; the detail views are all on larger scales than Figs. 2 and 8; and, some of the detail views-notably Figs. 10 and 13on a larger scale than the others; this having been found necessary to make some of the smaller parts 'distinct while keeping the drawings, as a whole, within reasonable limits.

The bed plate is designated by number l,

having standards 2 raised thereon, in which are set V-shaped agate bearings 3 for the knife edge fulcrum pivots 4a, consisting of the terminal parts of a transverse integral steel pivot bar 4, having its under side formed into a V-shaped knife edge extending throughout its length. A similar pivot bar 5, having an upwardly presented edge and extended bearing pivots 5a, supports `the scoop small platform or scale-pan 6 by means of a yoke 7, to the. upper section 7a of which said yoke is detachably fastened by a screw 6a, said yoke section 7a having steel bearing blocks 8 fastened in it removably by screws 8, the under faces of which blocks are V-shaped to fit the knife edge of the pivot bar 5 as presented by its exposed ends 5a, constituting said bearing pivots. All of pivot bar 4' except the ends or pivots 4a is incased in a brass block or casting 9, having preferably the form of a nearly rectangular middle piece with two integral wings tapering laterally from it. All of the pivot bar 5 except ends or pivots 5a is similarly incased in a block or casting l0, which is the counter-part of block 9. rlhe middle parts of these blocks have a central opening 119 for the main scale-beam 1l. These blocks may be cast together as one piece, see Fig. 1 5) on said pivot rods or may be made two separate blocks, Fig. 11.

The scale-beam 11 consists of two sections arranged end to end, having overlapping tongues 115 and 116 and adapted to forni holes 117 and 118, litting the pivot bars 1 and 5 respectively. 1f made separate, each block t) or and its pivot bar et. or 5 is reversible and interchangeable with the other block and pivot bar, so that the less worn bar may be given the wear and strain of the fulcruni as needed. First one of said tongues, then the other, is passed into the central opening 11t) of the bloek or blocks. If the single block 9 be used it is turned over end for end interchanging the pivot bars in location and position, the said tongues being then inverted as above. Fastening screws may also be used for the shaft sections and block or blocks.

Heretofore ditliculty has often been found in keeping the knife edges of a pair of pivots precisely in line, on account of slight errors in litting them or unequal yielding in the parts holding them, or accidents alfecting them unequally. By making the two pivots in one single rod or bar having a continuous knife edge from end to end, l ani enabled to secure and retain exact correspondence i`n its two ends which serve as pivots and by incasing all the rest of the bar in a solid integral block of metal l brace it etfectually against all forms of strain. By making this incasing block of metal having a different expansibility under the heat 1 eonipensate for changes of temperature and insure a tight lit between said blocks and said scalebeam. As the rods e1 and 5 are of hard steel, the wear upon the pivots 41 5 is very slight, and the use of agate as bearing material for the fulcrnni-pivots which bear the chief strain, almost eliminate friction at that point. rlhe said upper section Ta of yoke or fralne T has the form of a broad inverted U, the downwardly presented arnis 13 of which are bifurcated to straddle the pivots 5a and blocks 1st of the main part of the frame, to which the nu1n ber 7 is especially applied. The said bifurcated ends lit against the sides of said blocks and are braced thereby. rl`he lower or main section of this yoke or frame is also provided with raised terlninal plates 15, which fit against and cover the outer ends of the bifurcated arms 1? and are attached removably thereto by screws 16. The upper seetion 7 of the yoke is thus held rigidly (though detaehably) to the niain body thereof and braced by the overlapping of blocks 1t by bifurcated arms 13 and of said arms by plates 15, against' independent movement at any point, either forward or laterally with respect to the scale beam. This makes a very solid and secure supporting-frame for the scale pan, so that there. will be no looseness of parts. said trame being hung as statedby the bearing blocks S on the knife edge pivots 5 with the least possible amount of friction. )i conoidal block 1T, extending downward from the middle of the frame or yoke T, rests upon, and forms iu appearance the top of, a hollow truncated pedestal 1S, which is eastr with the plate 1, when the sale pan and yoke or `frame T are in their lowest position. This block 17, like the blocks 125 and plates 15, is integral with the main or lower section of yoke 7, each of the sections of the latter being preferably a single casting. A rod 1i), rigid with said block li', extends down through the open upper end of said pedestal, and its lower end is connected by a link 15), as heretofore known and used, with a rod extending rigidly down from bed plate 1 at a point under the fulcrum of the scale beam. The rod z' rises and falls with the scale pan and its supporting yoke in the usual way, the link 1S) yielding accordingly and the relatively large opening at the top of hollow pedestal 1S permitting the necessary amount of lateral play, although said rod and pedestal, with said link and tixed rod 20, sutliciently guide said frame in its up and down' movements.

The scale beam 11 is notched on its upper side to a low the shifting of the ordinary weight 21 t'rom point to point and is also marked with graduations as usual. The latter is also provided at a point near its end with a yoke or stirrup 2lof U-shape, having in its eyes at its upper ends downwardly presented V-shapcd bearings 25 which rest on the up Yardly turned knife edge of a straight steel pivot rod 26. On the other side of the fuleruin and scale-pan and near the latter another and similar yoke or stirrup 27 is similarly hung on said main scale beam, having a like pivot-rod 28 and bearings 2S). weight SO, provided, with a susl'iending hook, is connnonly hung on stirrup 2T and then answers the saine purpose as the shot or other weights often put in a receptacle suspended under the scale pan or forming part of the latter in steadying said pan, besides partly, c unte1.'balancing the weight 21 to make the beam weigh truly. 5y shifting this weight Il() to the stirrup 2l, without change of the other .veights, the machine may be arranged to weigh ten times as much, or in any other prcarrangcd ratio.

The computing linger or index -lO travels over a segmental computing dial, or chart `l1, adapted to show the price of the article weighed, by graduations arranged in any suitable denominations as has often heretofore been done. This index is bifnrcated to straddle the said chart or dial from below, one fork i17021 of said index passing' through an opening Lt2 in the lower part of said dial up along the rearof the latter, so as to hold the main indicating part of said index near the face of said dial. rllhis opening is between the converging side bars of the sector form metallic dial-frame L13, which frame is rigid and preferably integral with a supporty ing standard 1H, fastened at its base rigidly but detachably to plate 1. A back plate 45, with an opening 45a in its lower part, and a side plate 1'6 having its lower part cut away are cast in one piece with standard 4e, or rigidly attached, to form with said standard a rectangular upright frame open on the side toward the fulcrum of the scale-beam and having parts of them removed whenever they would obstruct the action of the moving parts.

r1`he rock-shaft Lt7 of the index is journaled on bearing rods 48 and 49, supported respectively in the upper end of standard a4 and the corresponding part of side plate 46, hereinafter more particularly described. On this index shaft a7 a stout short arm 5() provided with an eye or collar e7@ encircling the saine is fastened detachably by a screw 51, the latter permitting radial adjustment of said arm and of the said computing index or finger which is fastened thereto. The rear fork l0n of said index is detachably fastened to the main part thereof by a screw 52. Said shaft also carries two weighted screwthreaded arms 53 and 54;, which extend obliquely outward and downward in diverse directions, having a collar 532L integral with their converging ends, which collar is fastened on said shaft by a screw 55 detaehably and adjustably, as above stated of collar 47a. A sleeve-form weight 56, internally threaded is screwed up or down on arm 53 at will to regulate the action of said weight on said rock-shaft and index, a nut or nuts 58 being used to hold said weight in place. In like manner a similar weight 57 is screwed up or down on arm 54, being held by nut or nuts 59. As these weights 56 and 57 counterbalance each other, their relative adjustmentby the means shown will suffice to delicately regulate the action of the index in passing over the dial. rl`his rocking indexshaft 47 receives motion through an arm (SO, which is adjustably fastened on said shaft by screw 61, passing through a collar 61 integral with the upper end of said arm. The latter extends obliquely downward and away from the scale pan and scale-beam fulcrum and has its lower' part bent, the face of said lower part toward such fulcrum being angular and approximately in the shape of a broad V, whereas the convex opposite face of the lower part of said arm 60 is provided with a longitudinal slot 63. A perforation 6st is made from the middle point of the angle of said face 62 to said slot, flaring from the former to the latter so as to allow play, both laterally and vertically, between arm 60, which receives the impulse and a terminal rigid finger 65 of the arm G6, which gives such impulse. The end of the latter arm on each side of said finger is formed into a knife edge bearing, which fits into said angle of face 62, and said finger extends through said flaring perforations G4 and said slot 63 and is provided beyond the latter with a nut 67EL or other detachable head or collar, which will prevent said finger from being drawn back through said perforation and will compel said arm 65 backward as well as forward. The said knife edge and angle may remain in contact with each other and make at all times an antifriction oint between said parts, or the said nut may be adjusted to allow some movement of the thrusting arm 66 in returning from its operative stroke. The said needle is curved upward at the rear, to facilitate its movement through the perforated arm 60.

The thrusting arm 66 is preferably of steel, twisted for greater strength, and pivoted at its impulse-receiving end to the bifurcated upper part of a rocking frame 67 and between the two curved parallel integral bars 68 thereof. The thrust of said arm is horizontal or at an angle slightly varying therefrom and its position varies from inclination slightly downward to slightly upward, according to the rocking of frame 67. An adjusting screw 70 passes between the said bars thereof and through a nut 69, fixed on the rear ends of another bifurcated part of said frame or integral therewith. Said screw 70 constitutes an adjustable stop determining the extent of movement of frame 67 and consequently of the index in one direction, since the end of said screw will come in contact with the fixed back plate 45 when said frame 67 rocks back far enough,

therefore thus regulating the degree of rear-I ward rocking motion permitted to said frame and the forward motion of said index. The said screw is also provided with a nut 7i beyond said frame to prevent detachment, adjusted on said screw to regulate its leverage. Said screw may thus be used as a regulator for the position of the index or finger, somewhat after the manner of regulating a time-piece, and therefore cooperates in function with the two weighted arms on the index shaft, These three devices taken together, make possible the most delicate regulation and adjustment.

The frame 67 has a pivot bar 72 fixed transversely in it substantially the same in construction and arrangement as the fulcrum pivot bar of the main frame but shorter. The part of said frame through which it passes is a solid block, the said frame 67 being preferably cast as one piece of brass on said pivot bar. The pivot ends 72CL project therefrom and rest in V-shaped steel bea 1ing blocks 73 detachably held by screws 74; 1n

recessed beds T5, which are integral with standard lili and side plate 40 parallel and opposite to said standard. lletallic caps '7G for these bearing beds are held detachably thereto by screws 7T and provided with recesses 7G"y to tit over the proximate parts of the pivots 72 constituting parts of integral bar T2. The frame 0T is provided with a screw-threaded rigid rod T8,extending downward and forward (using the latter term to mean in the direction of the fulerum), on which rod a screw threaded counterbalance weight is adjustable up and down, being held by nuts T9 and S0 in any position to which it `may thus be adjusted. Said nuts are respectively above and below said weight on said shaft. This weight acts in opposition to the rear end of the scale beam, and after the latter ceases to act, said weight replaces in their former position the frame (3T the index and all parts which move with them. The rear side of frame (3T rounded to forni a surface S1, approximately constituting he narrow periphery of a wheel formed of the solid main part of said frame and passing between the two bifureated parts of said frame before described. A chain S2 is attached to a tixed transverse pin 83, which is passed through the two bars 08 of the raised bifurcated rearwardly curved part of said frame above mentioned. Tl ence said chain passes in Contact with said circular surface 81 to the rear thereof and down therefrom to a detachable hook SEL, pivoted in the bifin-cated upper end of a stout link block 8l, cast upon or otherwise rigidly attached to the middle part of a pivot-bar or pivot .rod S5, the knife edge of which is presented upward and runs from end to end, though, as in the case of the longer bars of this kind, only those parts of the knife edge which are on the parts of said bar projecting fromV the casting are used for pivoting. These pivotends .tit` into the inverted if-shaped downwardly presented recesses SG in the underside of the two arms of a U-shaped horizontal bearing casting Si, one of which arms marked SS is bifurcated on its under side, to straddle the main scale-beam before described. l`he rear end of said beam is provided with a rearwartfl rigid linger 8S), extending through the opening a before mentioned in back plate 15. This finger atfor s a handle for conveniently lifting said scale-beam out of engagement with the index-operating devices, and may also limit the up vard or downward movement of said beam by the contact of said finger with the material of said back plate lo at the upper end or lower end of said opening. The bifurcated lower end of said link block Slt is provided with a transverse pintle .00, passing through the head of the piston-rod 01 of a piston 92, operating in a dash-pot 93, sunk in bed plate 1 and below it. The upper end of said dash pot has a ring 011; screwed or otherwise secured therein, from which depends a funnel-shaped dashspot cover 05, which may be integral with said ring and has a tube 70 attached to it extending still farther down within the dash-pot and surrounding the piston rod 01. Hence the oil or other liquid `in said dash-pot, when lifted by said piston is stripped by the lower end of said tube from said rod at a point far down in the dash pot, and follows up around said tube and the funnel-shaped part or cover to the top of the dash pot between said part and the side wall, with no opportunity to escape from the pot around the piston-rod.

Certain details of parts already mentioned are important. rllhe pintle 00 extending across the space between the bars (SS at the upper end thereof, and serving to connect the arm (30 pivotally to said bars (S8 of the upper bifureated end of frame (37, is provided on each side thereof with an antifriction roller 9T, which is mainly cylindrical, but with convex ends that come in Contact respectively with the side of said armV 30 and the proximate bar (3S. These rollers serve to till the spaces between said arm and bars and to reduce the friction incident to any slight twisting motion of the latter.

The rock-shaft 4T which carries the index has at ea *h of its ends a rigidly attached cylindrical part or extension 08, the outer part of which is hollow, forming a chamber 00, closed on the outer side by a thin wall 100, having a. central perforation 101, which receives one of the fixed bearing rods t8 or ett) aforesaid. These parts 08, like the rest of the shaft and said rods are of hardened steel, so that there will. be no injurious wear, and the thinness of wall presents but a small frictional surface to rock on said rods. Such thinness would be impracticable unless the ends of shaft Lt-T were in e'tfeet shells, as above described. Each rod TLS or t-) has a. cylindrical brass block 103 cast or otherwise fixed thereon, said block being sety in a tubular lateral extension 102 of said stainlard -Llfl or the side wall t0 integral therewith and forn'iing part of the same upright frame. rllhese laterally extending parts 102 are screw apped to receive clamping screws 107i-, which turn into recesses 105 formed in said blocks 103, clamping said blocks against turning and also acting as stops to prevent their endwise movenlent substantially as .set forth. The caps covering the. endsl of the fulcrum pivot bar -l and the bearings below them are designated 100 and may be of any convenient form. rlhe usual suppleniental balance beam attached to the main beam under the same and rocking therewith is marked 10T and carries the usual adjustable weight 10S. The tare beam 10S) is held laterally and obliquely outward from `the `main scale beam as shown, and extends in a line parallel thereto, supporting its adjustable weight 110.

The operation of this price-computing weighing scale is necessarily similar in general principle to others of its kind and does not need explaining. Vhen the merchandise depresses the end of the beam nearest to 'the computing mechanism the index travels over the dial face to show the price. hen the weights on the other end of said scale beam are so shifted or increased as to raise the end thus depressed the downward pressure of the latter is relieved so that the index may correspondingly travel back toward its first position, and the continued liftingof said end under such excess of weight or leverage, after the computing mechanism ceases to move back, separates the open downwardly facing bearings carried thereby from the upwardly facing knife edge pivots formed by the small pivot rod or bar set in the link block which is hung by the chain from the rocking frame as before explained. Consequently no strain can be brought on said bearings or link or any other parts by the rising of the proximate end of the scale beam after they have ceased to rise.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A fulcrum pivot-bar, having a knife edge from end to end in combination with the scale beam of a pair of weighing scales, through which said bar passes, a block of metal fixed upon said scale-beam and said pivot-bar and incasing all of said pivot bar except its projecting terminal parts, which constitute fulcrum-pivots for said beam, a pair of bearing blocks having upwardly presented V -shaped faces to receive said pivots, means of support for said bearingblocks, into which the latter are set, and caps covering said pivots and bearings substantially as set forth.

In combination with a scale beam a block mounted thereon, an integral knife edge bar, extending transversely through said block and beam and projecting at each end beyond said block to present a pair of carrying pivots, a scale pan supporting frame, having V-shaped bearings set into its upper part and resting on said pivots and devices yieldingly connecting the said frame to a fixed part below it substantially as set forth.

A yoke or frame consisting of two solid castings which overlap at the ends and sides, to prevent the motion of either section either laterally or longitudinally and fit solidly together, said frame being provided internally with bearings and with means for attaching a scale-pan or its equivalent in combination with a scale-beam and pivot-s carried by said beam, the said bearings fitting on said pivots for carrying said scale pan.

l. A scale-pan-supporting frame, in combination with a scale-beam and carrying pivots mounted in said beam, the said frame consisting of a lower section provided with integral raised blocks and end pieces and the upper section bein provided with downwardly extending bifurcated parts, which straddle the blocks and iit against the inner faces of said end-pieces and having also bearings fastened in it, which fit on said pivots for supporting the scale-pan or equivalent device.

5. In combination with a scale-beam, a block fitting thereon, an integral pivot bar, provided with a knife edge from end to end, extending transversely through said beam and block and having its ends protruding from the latter to form carrying pivots, and a scale-pan-carrying frame provided with shaped bearing blocks which fit on the said pivots, said frame consisting of two sections, one of which overlaps the other at the sides, the latter section overlapping theformer at ,the ends the said sections being detachably fastened together.

6. A detachable scale-supporting frame, consisting of two sections overlapping both laterally and endwise, in combination with means for detachably fastening them together, a scale pan and means for attaching it to the upper section of said frame, removable bearing blocks and means for holding them to said upper section of the frame, a scale beam passing through said frame, a block on said beam within said frame, and a pivot bar extending transversely through said beam and block and having terminal parts which present knife edges to said bearings and thus serve as carrying pivots for said frame and the scale-pan substantially as set forth.

7. In combination with an index and a shaft carrying the same, two weighted circumferentially adjustable arms, mounted en said shaft and normally opposed in their action, a scale beam and interposed mechanism, whereby said beam rocks said shaft substantially as set forth.

8. A shaft provided at its ends with hollow parts, each of which has a thin terminal wall provided with a central hole, in combination with fixed bearing pins which enter such holes for journaling said shaft, an index carried by said shaft, a scale beam and connections whereby said beam operates said shaft substantially as set forth.

9. A bearing pin in combination with an index shaft j ournaled at one end thereon, a cylindrical block surrounding said rod and recessed at a point between its ends, a fixed support recessed to receive said block, a screw which works through a part of said support into said recess at will, to hold said block and bearing pin against turning and moving endwise, a scale-beam and means connecting said scale beam with the said index shaft substantially as set forth.

10. In combination with a scale beam and a computing index, a shaft carrying said index, an arm fixed on said shaft and having an angular or V-shaped face, a thrusting arm having a knife edge fitting into the angle of said face and means interposed between said scale-beam and said thrusting arm whereby the latter is forced against the first named arm to rock said shaft substantially as set forth.

11. In combination with a scale beam and a computing index, a shaft carrying said index, an arm on said shaft turning therewith and provided with an opening flaring from the impulse receiving side of said arm to the other side, a thrusting arm bearing with its end against the first named arm and having a finger which passes through said opening, and means interposed between said scale beam and said thrusting arm for giving thrusting motion to the latter the operating end of the scale beam descends substantially as set forth.

12. A scale-beam and a computing index, in combination with a shaft carrying said index an arm of said shaft moving therewith having a V-shaped face on its impulsereceiving side and its other face slotted and provided with an opening from the central point of the angle of the former face and flaring thence to said slot, a thrusting arm having on its end a knife-edge fitting said angle and a finger extending through said opening and allowed play b y the flare thereof, a rocking piece to which said thrusting arm is pivoted and devices interposed between said scale-beam and said rocking piece whereby said beam operates the latter substantially as set forth.

13. A scale beam and a computing index, in combination with a shaft carrying said index an arm attached to and turning with said shaft and having a V-shaped face on one side and a perforation at the middle point thereof extending through to the other side, a thrusting arm having on its end a knife edge fitting into the angle of said V- face and a finger projecting through said perforation, a nut or collar on said linger beyond the arm through which said linger passes in order that said knife edge and- V-face may be held in contact and the said arms may move together both ways, a. rocking device to which said thrusting arm is pivotally connected and mechanism interposed between said scale-beam and rocking device whereby said beam operates the latter substantially as set forth.

14s. A scale beam and a computing index, in combination with a shaft carrying said index, an arm on and moving with said shaft, a thrusting arm acting on the arm first mentioned to rock said shaft, a rocking` frame provided with bit'urcated arms and a cross-pin carried by said arms, on which pin said thrusting arm is pivotally mounted, a pair of rollers arranged on said pin and having' the said thrusting arm between them, said rollers being rounded at both ends or faces to diminish the friction of said thrusting arm and said frame, and devices interposed between said scale-beam and said rocking-frame, whereby the depression of one end of said beam rocks said frame substantially as setI forth.

15. In combination with a scale-beam and an index-carrying shaft, mechanism aetnated by said beam to rock said shaft and comprising a pivoted arm and a pair of antifriction rollers, rounded at each end, mounted on the pivot of said arm and interposed between the sides of said arm and proximate parts substantially as set forth.

16. ln combination with a scale-beam and a computing index a shaft carrying the latter, an arm of said shaft, a rocking device, an arm pivoted to said device and thrust outward endwise, thereby against the arm first mentioned to transmit rocking motion to said shaft, means interposed between said scale beam and said device whereby the depression of one end of said scale beam rocks said device in one direction and a counterbalance weight attached to said device, which weight tends to rock the latter in the other direction.

17. A scale-beam and a computing index, in combination with a shaft carrying said index and provided with an arm, a rocking frame which carries another arm acting on the former arm to rock said shaft, mans interposed between said scale beam and said frame whereby the depression of one end of said scale-beam rocks said frame in one direction, a screw-threznled rod or arm attached to said frame and a counterbalance weight adjustable on said rod and tending to rock ."aid frame in the opposite direction substantially as set forth.

18. ln combination with a scale beam and a computing index, a shaft carrying said index, a rocking frame, interlocking attachments of said frame and shaft whereby they rock together in opposite directions,

means interposed between said beam and the frame for actuating the latter by the depression of one end of the said beam, a screw passing' through said frame from fronti to rear and a fixed part arranged for contact with said screw whereby said screw becomes an adjustable stop regulating the rearward rocking of said frame and the forward movement of said index.

19. In combination with a scale beam and a computing index a shaft carrying said index, a rocking frame, an arm carried by said frame and an arm on said shaft whereby the motion of the former is transmitted to the latter but in the reverse direction, means interposed between the scale-beam and said frame whereby the depression of one end of said beam rocks the frame in the direction to move forward the index, a counter-balance weight attached to said frame and a part extending rearward through the said frame and serving as an additional regulator for the index.

20. In combination with a scale beam and a computing index, a shaft carrying said in dex, two oppositely acting, adjustable, counterbalance weights attached to said shaft, a rocking frame, having a convex surface practically forming a wheel, a chain attached to said frame near its front and ex tending` back over said surface and down below said wheel, a device connected to said chain, means carried by said scale beam and acting on said device to draw said chain down as the proximate end of said beam descends, and interlocking arms carried by said frame and shaft whereby the rocking motion of the former causes a reversed rocking motion of the latter substantially as set forth.

2l. In combination with a scale beam, a part carried by one end thereof and having downwardly opening pivot-bearings, a device provided with pivots on which said bearings set while the said end cf the beam is depressed, a computing index, devices interposed between said pivot bearings and said index and operating the latter by the former, the open construction of said bearings allowing said scale beam to readily free itself from said pivots and rise above them when the weights on the other end of the scale beam are so shifted or increased as to lift the end carrying said open bearings.

22. In combination with a scale beam and a computing index, a shaft carrying said index, a rocking frame, means for operating said frame from said beam, means for operating said shaft from said frame, a fixed frame supporting said rocking frame and said shaft, bearing blocks held in said fixed frame and having V-shaped upward faces and a pivot rod or bar having a knife edge formed on it fro-1n end to end, the middle part of said pivot bar being fixed and incased in a so-lid part of said rocking frame and the ends of said pivot bar fo-rming knife edge pivots for said frame and resting in said V -shaped faces substantially as set forth.

23. In combination with a scale beam and an index, a shaft carrying said index, a device carried by the proximate end of said scale-beam and having V-shaped bearings presented downward, a pivot rod having a knife edge extending along it from end to end, a link block incasing the middle part of said pivot rod, the projecting ends of which form pivots litting said V-shaped faces, and devices interposed between said block and said shaft, whereby the depression of said block will rock said shaft substantially as set forth.

24. A scale beam consisting of two sections, the proximate ends of which have parts constructed to overlap each other and leave two openings for the pivot bars, in combination with two interchangeable pivot bars and two interchangeable blocks, each fixed on one of said pivot bars, said blocks being adapted to surround said scale beam at the joint and suitable means being provided for fastening said blocks and scale beam sections together substantially as set forth.

25. In combination with a scale beam, a pair of fulcrum bearing blocks, two reversible and interchangeable pivot bars passing through said scale beam, each having a knife edge formed on it from end to end, a pair of supporting bearings in which the ends of one of said bars rest as fulcrum pivots, a pair of bearings resting on the knife edge of the terminal parts of the other pivot bar and a scale-supporting device having the latter bearings fastened therein substantially as set forth.

26. A scale beam consisting of two overlapping sections, in combination with reversible means adapted to fasten them together, and pivot rods respectively embedded at their middle parts in said means, said rods being provided with knife edges extending from end to end of them, one of such edges being presented upward, the other downward, and these pivot rods being reversible with said means and interchange able substantially as set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ABRAHAM H. SHOCK. Witnesses:

S. K. BETNER, AMos E. BURKHOLDER. 

